"Language competency" refers to someone's ability to understand and effectively communicate in a particular language. It means being proficient or skilled in using that language in both written and spoken forms. Full definition
First, writer applicants must complete a test to check their English language competency level and grammatical skills. (writemypaperhub.com)
Since early vocabulary skills are not necessarily related across languages, a full assessment of a bilingual child's early language competency should account for their skills in both languages. (gse.harvard.edu)
Native - language speakers may be your most valuable asset in evaluating language competencies. (elearningindustry.com)